I had a similar dilemma to yourself, decided to get a standard car (bought a 370z GT Edition) with the aim to buy the 2015 Nismo Kit.
It can be done but it will cost you in the region of £1500 (genuine parts) then add £1300 to that if you want the genuine LED DRL's) + paint for the body kit - extra if you want the wheels and mirror covers.
Front is a direct fit but a few extras are needed such as wheel arch extenders, DRL's, plate holder (I taped mine to the bumper), tow eye cover, red inserts for front bumper, NISMO badges (not cheap), I think there are mounts for the pedestrian impact sensors too.
Side skirts go straight on and require no extra parts.
Not sure if anyone had done a rear yet, so I don't know the parts required on top of the bumper itself.
One bit of advice Pearl White is a nightmare the colour match if that's the colour you wanted. Looks stunning in the sun though.